Skip non canonical chromosome

Maybe could be useful to add a test in order to skip the non canonical chromosome in the markvcf.py script.

Here there is the error I got

Traceback (most recent call last): File "/home/vmaselli/utils/markvcf.py", line 213, in <module> if name == "main": mark_main() File "/home/vmaselli/utils/markvcf.py", line 209, in mark_main annotate_vcf(options.vcf, gene_properties, options.name) File "/home/vmaselli/utils/markvcf.py", line 147, in annotate_vcf if not gene_props[chrom]: KeyError: 'chr11_gl000202_random'

fixed in changeset: 130:f48b956752d4